Nice work Ernie, very impressive!
I hope someone isn't already splashing it.

Ernie you using Mech desktop?
I have all the current ACAD Arch desktop 3.3
and ACAD 2004 does Mech desktop have more tools
for making the machine parts?

Check out this picture. You can see the surface drive that you designed in action at the website

N2Speed Website

KILLER VIDEOS

I called the guy at N2Speed about these surface drives. He makes them himself and they are very $$$$. The rudder is titanium.

I prefer the N2's trim cylinder mounting location.

Top, your tapered housing doesn't appear to have adequate diameter on the "prop end" for the appropriate size of thrust bearing packs.

My design was done for fun and is not meant to be functional... it is a tool for learning
CAD and I thought I would atleast design something that I liked. But since you guys are getting all technical I guess I'll have to design one that will work. I can't believe with all these critiques that you guys have not noticed the props concave the wrong way.

Oh and I use autoCAD 2002 I don't know much about any other design programs.

Ernie

course we noticed the props.
not trying to send a catalog of imperfections, only significant design conflicts.

and if you didn't want it critiqued, then you sent it to the wrong place.

2002? Bless your heart. You're spending a lot of time stitching together those 3D entities using that set of tools. Mech Desktop is a big improvement (but is still lacking in many ways). BUT, the goodpart is you are learning the 3D work from the bottom level and you will be a better draftsman because of it. When you get a powerful set of tools to use, you will be able to understand them and adopt them very quickly.

Now let's get some thrust bearings on that propshaft...

I haven't had much spare time this week but here are the newest creations. Another drive in 3D this one has more accurate measurements, bearings, and a u-joint that is built from dimensions of a real one. Stainless u joint 1.5" shaft size that takes 55000 inlb torque at 35deg max angle. that is 4583.33 and these guys are testing brake torque. If you don't understand that it means this little u joint will handle just about any powerplant you feed it.

Ernie

No pic posting today. site isn't working right. does any one have the .dwg files for merc engines and stern drives? They are needed for my boat drawings and I can't find them.

Ernie